9os

commit 4bf8e34798442687c59ed815248bdc4ab71e8759
parent 876558ef0200bc66ec6271c929e8cb6857137e35
Author: Roberto E. Vargas Caballero <roberto.vargas@midokura.com>
Date:   Fri, 18 Nov 2022 14:43:52 +0100

os9: Add freefds()

We add a pool of objects that can be reused if they are freed.

Diffstat:
M
include/os9/os9.h
 | 
1
+
M
src/os9/proc.c
 | 
21
++++++++++++++++++---

2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/include/os9/os9.h b/include/os9/os9.h
@@ -169,6 +169,7 @@ struct fdset {
 	Ref ref;
 	mutex_t m;
 	Chan fdset[NR_CHANS];
+	Fdset *next;
 };
 
 /**
diff --git a/src/os9/proc.c b/src/os9/proc.c
@@ -13,6 +13,11 @@ static struct {
 	mutex_t m;
 } nspool;
 
+static struct {
+	Fdset *list;
+	mutex_t m;
+} fdspool;
+
 /* per cpu globals */
 Task *proc;
 long long now;
@@ -272,8 +277,15 @@ newfds(Fdset *from)
 {
 	Fdset *fds;
 
-	if ((fds = alloc(sizeof(*fds))) == NULL)
-		return NULL;
+	lock(&fdspool.m);
+	if (fdspool.list) {
+		fds = fdspool.list;
+		fdspool.list = fds->next;
+	} else {
+		if ((fds = alloc(sizeof(*fds))) == NULL)
+			return NULL;
+	}
+	unlock(&fdspool.m);
 
 	*fds = (from) ? *from : (Fdset) {0};
 	initref(&fds->ref);
@@ -308,7 +320,10 @@ freespace(Nspace *ns)
 static void
 freefds(Fdset *fds)
 {
-	/* TODO */
+	lock(&fdspool.m);
+	fds->next = fdspool.list;
+	fdspool.list = fds;
+	unlock(&fdspool.m);
 }
 
 static void